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ARCH Venture Partners X, LLC, 10% owner at Boundless Bio, sold BOLD on Jul 1, 2026

Data as of Oct 16

▼ SELL$39.8K16,000 shares at $2.49ARCH Venture Partners X, LLC 10% ownerBOLD Boundless Bio, Inc.
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Traded
Jul 1, 2026
Disclosed
Jul 6, 2026
Filed
5 days after the trade · late

Form 4s are due within two business days.

Official filing (SEC Form 4) ↗

The price around the disclosure

ARCH Venture Partners X, LLC, 10% owner at Boundless Bio, sold BOLD on Jul 1, 2026TRADEDDISCLOSED
BOLDSimilar stocks (XLV — its sector index fund), rebased to BOLD's price on the disclosure day
BOLD since disclosure
−6.4%
after the sale
Similar stocks (XLV) since disclosure
+9.1%
XLV — its sector index fund

Change in closing price from Jul 6, 2026 (the first trading day on or after disclosure) to Oct 16, 2026. Dividends excluded. Not a return anyone earned.

Our take

None of our tested rules fired on this trade.

Other trades in the same filing

  1. ▼ SELLARCH Venture Partners IX, L.P. 10% ownerBOLD Boundless Bio, Inc.$39.8Kdisclosed Jul 6 · filed 5 days after the trade · late
  2. ▼ SELLARCH Venture Partners IX Overage, L.P. 10% ownerBOLD Boundless Bio, Inc.$39.8Kdisclosed Jul 6 · filed 5 days after the trade · late
  3. ▼ SELLARCH Venture Partners X Overage, L.P. 10% ownerBOLD Boundless Bio, Inc.$39.8Kdisclosed Jul 6 · filed 5 days after the trade · late
  4. ▼ SELLARCH Venture Partners IX, LLC 10% ownerBOLD Boundless Bio, Inc.$39.8Kdisclosed Jul 6 · filed 5 days after the trade · late
  5. ▼ SELLARCH Venture Fund IX Overage, L.P. 10% ownerBOLD Boundless Bio, Inc.$39.8Kdisclosed Jul 6 · filed 5 days after the trade · late
  6. ▼ SELLARCH Venture Fund X Overage, L.P. 10% ownerBOLD Boundless Bio, Inc.$39.8Kdisclosed Jul 6 · filed 5 days after the trade · late
  7. ▼ SELLARCH Venture Fund IX, L.P. 10% ownerBOLD Boundless Bio, Inc.$39.8Kdisclosed Jul 6 · filed 5 days after the trade · late

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